Semiconductor device structure with magnetic element

ABSTRACT

A semiconductor device structure is provided. The semiconductor device structure includes a semiconductor substrate and multiple first conductive lines over the semiconductor substrate. The first conductive lines are not electrically connected to each other. The semiconductor device structure also includes multiple first magnetic structures wrapped around portions of the first conductive lines and multiple second conductive lines over the semiconductor substrate. The second conductive lines are electrically connected in series. The semiconductor device structure further includes multiple second magnetic structures wrapped around portions of the second conductive lines. A size of each of the second magnetic structures and a size of each of the first magnetic structures are substantially the same.

PRIORITY CLAIM AND CROSS-REFERENCE

This Application is a Continuation application of U.S. application Ser. No. 17/328,801, filed on May 24, 2021, which is a Continuation application of U.S. application Ser. No. 16/548,183, filed on Aug. 22, 2019 (now U.S. Pat. No. 11,018,065, issued on May 25, 2021), the entirety of which are incorporated by reference herein.

BACKGROUND

The semiconductor integrated circuit (IC) industry has experienced rapid growth. Technological advances in IC materials and design have produced generations of ICs. Each generation has smaller and more complex circuits than the previous generation. In the course of IC evolution, functional density (i.e., the number of interconnected devices per chip area) has generally increased while geometric size (i.e., the smallest component (or line) that can be created using a fabrication process) has decreased. This scaling-down process generally provides benefits by increasing production efficiency and lowering associated costs.

One of the factors in the continuing evolution toward smaller device size and higher density has been the ability to consistently form reliable integrated circuit at smaller critical dimensions. In integrated circuit (IC) manufacturing, a semiconductor wafer may contain multiple test structures between wafer die areas. Each test structure includes one or more test devices, which are devices similar to those that are used to form the integrated circuit products in the wafer die areas. By studying the test structures, it is possible to monitor, improve, and refine a semiconductor manufacturing process. For example, the reliability and electrical continuity of integrated circuitry wiring is determined by electrical continuity measurement methods following formation of a metallization level of circuitry wiring, also referred to as acceptance testing (WAT), to quickly determine and correct processing variables that may be causing circuitry defects.

There is a continuing need in the semiconductor device manufacturing art for improved wafer acceptance testing (WAT) methods. However, since feature sizes continue to decrease, fabrication processes and the corresponding testing processes continue to become more difficult to perform. Therefore, it is a challenge to monitor, improve, and refine the manufacturing processes of semiconductor devices with smaller and smaller sizes.

BRIEF DESCRIPTION OF THE DRAWINGS

Aspects of the present disclosure are best understood from the following detailed description when read with the accompanying figures. It should be noted that, in accordance with the standard practice in the industry, various features are not drawn to scale. In fact, the dimensions of the various features may be arbitrarily increased or reduced for clarity of discussion.

FIG. 1 is a top view of a semiconductor device structure, in accordance with some embodiments.

FIG. 2 is a top layout view of a semiconductor device structure, in accordance with some embodiments.

FIG. 3 is a cross-sectional view of a semiconductor device structure, in accordance with some embodiments.

FIG. 4 is a cross-sectional view of a semiconductor device structure, in accordance with some embodiments.

FIG. 5 is a cross-sectional view of a semiconductor device structure, in accordance with some embodiments.

FIG. 6 is a cross-sectional view of a semiconductor device structure, in accordance with some embodiments.

FIG. 7 is a top layout view of a shielding element of a semiconductor device structure, in accordance with some embodiments.

FIG. 8 is a top layout view of conductive lines of a semiconductor device structure, in accordance with some embodiments.

FIG. 9 is a top view of a semiconductor device structure, in accordance with some embodiments.

FIG. 10 is a top view of a semiconductor device structure, in accordance with some embodiments.

DETAILED DESCRIPTION

The following disclosure provides many different embodiments, or examples, for implementing different features of the provided subject matter. Specific examples of components and arrangements are described below to simplify the present disclosure. These are, of course, merely examples and are not intended to be limiting. For example, the formation of a first feature over or on a second feature in the description that follows may include embodiments in which the first and second features are formed in direct contact, and may also include embodiments in which additional features may be formed between the first and second features, such that the first and second features may not be in direct contact. In addition, the present disclosure may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.

Further, spatially relative terms, such as “beneath,” “below,” “lower,” “above,” “upper” and the like, may be used herein for ease of description to describe one element or feature's relationship to another element(s) or feature(s) as illustrated in the figures. The spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. The apparatus may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein may likewise be interpreted accordingly.

The term “substantially” in the description, such as in “substantially flat” or in “substantially coplanar”, etc., will be understood by the person skilled in the art. In some embodiments the adjective substantially may be removed. Where applicable, the term “substantially” may also include embodiments with “entirely”, “completely”, “all”, etc. Where applicable, the term “substantially” may also relate to 90% or higher, such as 95% or higher, especially 99% or higher, including 100%. Furthermore, terms such as “substantially parallel” or “substantially perpendicular” are to be interpreted as not to exclude insignificant deviation from the specified arrangement and may include for example deviations of up to 10°. The word “substantially” does not exclude “completely” e.g. a composition which is “substantially free” from Y may be completely free from Y.

Terms such as “about” in conjunction with a specific distance or size are to be interpreted so as not to exclude insignificant deviation from the specified distance or size and may include for example deviations of up to 10%. The term “about” in relation to a numerical value x may mean x±5 or 10%.

Some embodiments of the disclosure are described. Additional operations can be provided before, during, and/or after the stages described in these embodiments. Some of the stages that are described can be replaced or eliminated for different embodiments. Additional features can be added to the semiconductor device structure. Some of the features described below can be replaced or eliminated for different embodiments. Although some embodiments are discussed with operations performed in a particular order, these operations may be performed in another logical order.

FIG. 1 is a top view of a semiconductor device structure 10, in accordance with some embodiments. In some embodiments, the semiconductor device structure 10 is a semiconductor wafer. The semiconductor device structure 10 includes multiple device regions (or die regions) 102 and multiple testing regions 104. In some embodiments, each of the testing regions 104 is surrounded by some of the device regions 102. In some embodiments, each of the testing regions 104 has a smaller area than the area of each of the device regions 102.

In some embodiments, the testing regions 104 include devices that are similar to or substantially the same as those formed in the device regions 102. In some embodiments, the devices formed in the testing regions 104 and the device regions 102 are simultaneously formed using the same processes. In some embodiments, both the testing regions 104 and the device regions 102 include inductors such as mutual inductors. By studying and/or inspecting the devices formed in the testing regions 104, it is possible to monitor, improve, and refine a semiconductor manufacturing process timely. For example, the quality and reliability of the inductors formed in the device regions 102 may be monitored timely by detecting the electrical signals obtained from the devices formed in the testing regions 104.

In some embodiments, each of the testing regions 104 occupies a smaller area than the area occupied by each of the device regions 102. However, embodiments of the disclosure are not limited thereto. Many variations and/or modifications can be made to embodiments of the disclosure. FIG. 9 is a top view of a semiconductor device structure, in accordance with some embodiments. In some embodiments, each of the testing regions 104 occupies an area that is substantially the same as the area occupied by each of the device regions 102.

Many variations and/or modifications can be made to embodiments of the disclosure. FIG. 10 is a top view of a semiconductor device structure, in accordance with some embodiments. In some embodiments, the testing regions 104 are formed in the scribe lines SC between the device regions 102.

FIG. 2 is a top layout view of a semiconductor device structure, in accordance with some embodiments. In FIG. 2 , one of the device regions 102 and one of the testing regions 104 are shown. In some embodiments, the device regions 102 include multiple inductors that are arranged in a column. In some embodiments, the inductors are mutual inductors.

However, many variations and/or modifications can be made to embodiments of the disclosure. In some other embodiments, some or all of the inductors formed in the device regions 102 are self-inductors.

FIG. 3 is a cross-sectional view of a semiconductor device structure, in accordance with some embodiments. In some embodiments, FIG. 3 shows the cross-sectional view of the semiconductor device structure taken along the line 3-3 in FIG. 2 .

As shown in FIG. 3 , the semiconductor device structure includes a semiconductor substrate 400 and an interconnection structure 402 formed over the semiconductor substrate 400. The interconnection structure 402 may include multiple dielectric layers and multiple conductive features. The conductive features may include conductive lines, conductive contacts, and conductive vias. These conductive features form electrical connections between the device elements and other elements to be formed later. In some embodiments, an insulating layer 404 is formed over the interconnection structure 402. The insulating layer 404 may be made of or include a polymer material. For example, the polymer material includes polyimide or another suitable material.

As shown in FIGS. 2 and 3 , multiple magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄ are formed over the insulating layer 404, in accordance with some embodiments. In some embodiments, each of the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄ is a stack of multiple magnetic sub-layers. The magnetic sub-layers may be made of or include an alloy containing cobalt, zirconium, and tantalum (CZT), an alloy containing cobalt and zirconium, an alloy containing iron and nickel, one or more other suitable materials, or a combination thereof. Many variations and/or modifications can be made to embodiments of the disclosure. In some other embodiments, each of the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄ is a single-layer structure.

The formation of the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄ may involve one or more deposition processes and one or more patterning processes. The deposition processes may include a physical vapor deposition (PVD) process, a chemical vapor deposition (CVD) process, an atomic layer deposition (ALD) process, one or more other applicable processes, or a combination thereof. The patterning processes may include the formation of patterned hard masks and one or more etching processes. In some embodiments, a stack of multiple magnetic material layers are deposited. Afterwards, one or more photolithography processes and one or more etching processes are used to partially remove the magnetic material layers. As a result, the remaining portions of the magnetic material layers form multiple magnetic elements including the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄.

As shown in FIG. 3 , isolation elements 303 are formed over the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄, in accordance with some embodiments. The isolation elements 303 may be used to electrically isolate the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄ from conductive lines that will be formed over the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄. The isolation elements 303 may be made of or include silicon nitride, silicon oxynitride, silicon oxide, one or more other suitable materials, or a combination thereof. The formation of the isolation elements 303 may involve a deposition process and a patterning process.

As shown in FIGS. 2 and 3 , multiple conductive lines 304A₁, 304A₂, 304A₃, and 304A₄ are formed over the insulating layer 404 and the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄, in accordance with some embodiments. The isolation elements 303 separate the conductive lines 304A₁, 304A₂, 304A₃, and 304A₄ from the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄. As shown in FIG. 2 , the conductive lines 304A₁, 304A₂, 304A₃, and 304A₄ extends across the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄, respectively. In some embodiments, the conductive lines 304A₁, 304A₂, 304A₃, and 304A₄ are not electrically connected to each other. In some embodiments, the conductive lines 304A₁, 304A₂, 304A₃, and 304A₄ are physically separated from each other. Subsequently formed protective elements or isolation elements may be used to electrically isolate the conductive lines 304A₁, 304A₂, 304A₃, and 304A₄ from each other.

As shown in FIGS. 2 and 3 , multiple conductive lines 306A₁, 306A₂, 306A₃, and 306A₄ are formed over the insulating layer 404 and the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄, in accordance with some embodiments. The isolation elements 303 separate the conductive lines 306A₁, 306A₂, 306A₃, and 306A₄ from the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄. As shown in FIG. 2 , the conductive lines 306A₁, 306A₂, 306A₃, and 306A₄ extends across the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄, respectively. In some embodiments, the conductive lines 306A₁, 306A₂, 306A₃, and 306A₄ are not electrically connected to each other. In some embodiments, the conductive lines 306A₁, 306A₂, 306A₃, and 306A₄ are physically separated from each other. In some embodiments, each of the conductive lines 306A₁, 306A₂, 306A₃, and 306A₄ is not electrically connected to the conductive lines 304A₁, 304A₂, 304A₃, and 304A₄. Subsequently formed protective elements or isolation elements may be used to electrically isolate the conductive lines 304A₁, 304A₂, 304A₃, 304A₄, 306A₁, 306A₂, 306A₃, and 306A₄ from each other.

The conductive lines 304A₁, 304A₂, 304A₃, 304A₄, 306A₁, 306A₂, 306A₃, and 306A₄ may be made of or include copper, cobalt, aluminum, titanium, gold, one or more other suitable materials, or a combination thereof. The conductive lines 304A₁, 304A₂, 304A₃, 304A₄, 306A₁, 306A₂, 306A₃, and 306A₄ may be formed using an electroplating process, an electroless plating process, a PVD process, a CVD process, one or more other applicable processes, or a combination thereof. In some embodiments, the conductive lines 304A₁, 304A₂, 304A₃, 304A₄, 306A₁, 306A₂, 306A₃, and 306A₄ are simultaneously formed.

As shown in FIG. 3 , protective elements 406 are formed to cover and protect the conductive lines 304A₁, 304A₂, 304A₃, 304A₄, 306A₁, 306A₂, 306A₃, and 306A₄, in accordance with some embodiments. The protective elements 406 may also be used to electrically isolate the conductive lines 304A₁, 304A₂, 304A₃, 304A₄, 306A₁, 306A₂, 306A₃, and 306A₄ from each other. The protective elements 406 may be made of or include a polymer material. The polymer material may include polyimide, epoxy-based resin, one or more other suitable materials, or a combination thereof. The formation of the protective elements 406 may involve a coating process and a photolithography process.

Afterwards, magnetic materials 408A₁, 408A₂, 408A₃, and 408A₄ are formed over the protective elements 406 to cover the conductive lines 304A₁, 304A₂, 304A₃, 304A₄, 306A₁, 306A₂, 306A₃, and 306A₄, as shown in FIG. 3 in accordance with some embodiments. Each of the magnetic materials 408A₁, 408A₂, 408A₃, and 408A₄ partially covers the conductive lines thereunder, as shown in FIGS. 2 and 3 in accordance with some embodiments. The material and formation method of the magnetic materials 408A₁, 408A₂, 408A₃, and 408A₄ may be the same as or similar to those of the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄.

Afterwards, protective elements 412 are formed to cover and protect the magnetic materials 408A₁, 408A₂, 408A₃, and 408A₄, as shown in FIG. 3 in accordance with some embodiments. The material and formation method of the protective elements 412 may be the same as or similar to those of the protective elements 406.

The magnetic materials and the magnetic elements together form multiple magnetic structures that wrap around portions of the conductive lines correspondingly. As shown in FIGS. 2 and 3 , multiple magnetic structures 410A₁, 410A₂, 410A₃, and 410A₄are formed. In FIG. 2 , some elements shown in FIG. 3 are not shown in FIG. 2 for clarity. For example, the protective elements 406 and the magnetic materials 408A₁, 408A₂, 408A₃, and 408A₄ are not shown in FIG. 2 . Therefore, the relationship between the conductive lines and the magnetic elements may be shown more clearly.

As shown in FIGS. 2 and 3 , the magnetic structure 410A₁ constructed by the magnetic element 302A₁ and the magnetic material 408A₁ wraps around a portion of the conductive line 304A₁ and a portion of the conductive line 306A₁, in accordance with some embodiments. Similarly, the magnetic structures 410A₂, 410A₃, and 410A₄ wraps around portions of the conductive lines 304A₂, 304A₃, and 304A₄, respectively. In some embodiments, the magnetic structures 410A₂, 410A₃, and 410A₄ also wraps around portions of the conductive lines 306A₂, 306A₃, and 306A₄, respectively.

In some embodiments, the magnetic structure 410A₁ and the portion of the conductive line 304A₁ surrounded by the magnetic structure 410A₁ together forms a first inductor. The magnetic structure 410A₁ and the portion of the conductive line 306A₁ surrounded by the magnetic structure 410A₁ together forms a second inductor. The first inductor and the second inductor may together form a mutual inductor. As shown in FIGS. 2 and 3 , four mutual inductors each including the magnetic structures 410A₁, 410A₂, 410A₃, and 410A₄ are formed.

As shown in FIG. 2 , similar to the device region 102, the testing region 104 also includes multiple inductors. In some embodiments, the inductors in the testing region 104 are arranged in a column. The inductors formed in the testing region 104 are substantially the same as those formed in the device region 102. The inductors in the testing region 104 and the device region 102 are formed using substantially the same process at the same time. Therefore, by detecting the quality and/or electrical properties of the inductors formed in the testing region 104, the corresponding quality and/or electrical properties of the inductors formed in the device region 102 are also obtained. By studying the inductors in the testing region 104, it is possible to timely monitor, improve, and refine a manufacturing process for forming the inductors in the device region 102.

FIG. 4 is a cross-sectional view of a semiconductor device structure, in accordance with some embodiments. In some embodiments, FIG. 4 shows the cross-sectional view of the semiconductor device structure taken along the line 4-4 in FIG. 2 .

As shown in FIGS. 2 and 4 , similar to the device region 102, multiple magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄ are formed in the testing region 104, in accordance with some embodiments. The material and formation method of the magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄ are the same as those of the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄ in the device region 102. The magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄ and the magnetic elements 302A₁, 302A₂, 302A₃, and 302A₄are simultaneously formed using the same processes.

As shown in FIG. 4 , isolation elements 303′ are formed over the magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄, in accordance with some embodiments. The isolation elements 303′ may be used to electrically isolate the magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄ from conductive lines that will be formed over the magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄. The material and formation method of the isolation elements 303′ may be the same as those of the isolation elements 303 in the device region 102. The isolation elements 303 and 303′ are simultaneously formed using the same processes.

As shown in FIGS. 2 and 4 , similar to the device region 102, multiple conductive lines 304B₁, 304B₂, 304B₃, and 304B₄ are formed over the insulating layer 404 and the magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄, in accordance with some embodiments. As shown in FIG. 2 , the conductive lines 304B₁, 304B₂, 304B₃, and 304B₄extends across the magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄, respectively. In some embodiments, different from the conductive lines 304A₁, 304A₂, 304A₃, and 304A₄that are electrically isolated from each other, the conductive lines 304B₁, 304B₂, 304B₃, and 304B₄ are electrically connected to each other.

As shown in FIG. 2 , the conductive lines 304B₁, 304B₂, 304B₃, and 304B₄ are electrically connected in series, in accordance with some embodiments. In some embodiments, the conductive lines 304B₂ and 304B₃ are electrically connected in series through a connection portion 304C, as shown in FIG. 2 . In some embodiments, the conductive lines 304B₁ and 304B₂ are electrically connected in series through a conductive feature 308A that is formed between the insulating layer 404 and the semiconductor substrate 400. In some embodiments, the conductive feature 308A is formed in the interconnection structure 402. In FIG. 2 , the conductive feature 308A that is below the insulating layer 404 is illustrated in dotted lines. In some embodiments, the conductive lines 304B₃ and 304B₄ are electrically connected in series through a conductive feature 308B that is formed between the insulating layer 404 and the semiconductor substrate 400.

As shown in FIGS. 2 and 4 , multiple conductive lines 306B₁, 306B₂, 306B₃, and 306B₄ are formed over the insulating layer 404 and the magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄, in accordance with some embodiments. As shown in FIG. 2 , the conductive lines 306B₁, 306B₂, 306B₃, and 306B₄ extends across the magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄, respectively. In some embodiments, different from the conductive lines 306A₁, 306A₂, 306A₃, and 306A₄ that are electrically isolated from each other, the conductive lines 306B₁, 306B₂, 306B₃, and 306B₄ are electrically connected to each other. In some embodiments, each of the conductive lines 306B₁, 306B₂, 306B₃, and 306B₄ is not electrically connected to the conductive lines 304B₁, 304B₂, 304B₃, and 304B₄. Subsequently formed protective elements or isolation elements may be used to electrically isolate the conductive lines 304B₁, 304B₂, 304B₃, and 304B₄ from the conductive lines 306B₁, 306B₂, 306B₃, and 306B₄.

As shown in FIG. 2 , the conductive lines 306B₁, 306B₂, 306B₃, and 306B₄ are electrically connected in series, in accordance with some embodiments. In some embodiments, the conductive lines 306B₂ and 306B₃ are electrically connected in series through a connection portion 306C, as shown in FIG. 2 . In some embodiments, the conductive lines 306B₁ and 306B₂ are electrically connected in series through a conductive feature 310A that is formed between the insulating layer 404 and the semiconductor substrate 400. In some embodiments, the conductive feature 310A is formed in the interconnection structure 402. In FIG. 2 , the conductive feature 310A that is below the insulating layer 404 is illustrated in dotted lines. In some embodiments, the conductive lines 306B₃ and 306B₄ are electrically connected in series through a conductive feature 310B that is formed between the insulating layer 404 and the semiconductor substrate 400.

In some embodiments, the conductive line 306B₁ extends across the conductive feature 308A that links the conductive lines 304B₁ and the 304B₂, as shown in FIG. 2 . The conductive line 306B₁ is electrically isolated from the conductive feature 308A by the insulating layer 404. In some embodiments, the conductive line 306B₃ extends across the conductive feature 308B that links the conductive lines 304B₃ and the 304B₄, as shown in FIG. 2 . The conductive line 306B₃ is electrically isolated from the conductive feature 308B by the insulating layer 404.

In some embodiments, the conductive line 304B₂ extends across the conductive feature 310A that links the conductive lines 306B₁ and the 306B₂, as shown in FIG. 2 . The conductive line 304B₂ is electrically isolated from the conductive feature 310A by the insulating layer 404. In some embodiments, the conductive line 304B₄ extends across the conductive feature 310B that links the conductive lines 306B₃ and the 306B₄, as shown in FIG. 2 . The conductive line 304B₄ is electrically isolated from the conductive feature 310B by the insulating layer 404.

The material and formation method of the conductive lines 304B₁, 304B₂, 304B₃, 304B₄, 306B₁, 306B₂, 306B₃, and 306B₄ are the same as those of the conductive lines 304A₁, 304A₂, 304A₃, 304A₄, 306A₁, 306A₂, 306A₃, and 306A₄. In some embodiments, these conductive lines are simultaneously formed using the same processes.

As shown in FIG. 4 , protective elements 406′ are formed to cover and protect the conductive lines 304B₁, 304B₂, 304B₃, 304B₄, 306B₁, 306B₂, 306B₃, and 306B₄, in accordance with some embodiments. The material and formation method of the protective elements 406′ may be the same as those of the protective elements 406 in the device region 102. In some embodiments, the protective elements 406′ and 406 are simultaneously formed using the same processes.

Afterwards, magnetic materials 408B₁, 408B₂, 408B₃, and 408B₄ are formed over the protective elements 406′ to cover the conductive lines 304B₁, 304B₂, 304B₃, 304B₄, 306B₁, 306B₂, 306B₃, and 306B₄, as shown in FIG. 4 in accordance with some embodiments. The material and formation method of the magnetic materials 408B₁, 408B₂, 408B₃, and 408B₄ may be the same as or similar to those of the magnetic materials 408A₁, 408A₂, 408A₃, and 408A₄. In some embodiments, the magnetic materials 408B₁, 408B₂, 408B₃, and 408B₄ and the magnetic materials 408A₁, 408A₂, 408A₃, and 408A₄ are simultaneously formed using the same processes.

Afterwards, protective elements 412′ are formed to cover and protect the magnetic materials 408B₁, 408B₂, 408B₃, and 408B₄, as shown in FIG. 4 in accordance with some embodiments. The material and formation method of the protective elements 412′ may be the same as or similar to those of the protective elements 412 in the device region 102. In some embodiments, the protective elements 412′ and 412 are simultaneously formed using the same processes.

The magnetic materials and the magnetic elements together form multiple magnetic structures that wrap around portions of the conductive lines correspondingly. As shown in FIGS. 2 and 4 , multiple magnetic structures 410B₁, 410B₂, 410B₃, and 410B₄ are formed. In some embodiments, each of the magnetic structures 410B₁, 410B₂, 410B₃, and 410B₄ has a shape and a size that are substantially the same as those of each of the magnetic structures 410A₁, 410A₂, 410A₃, and 410A₄ in the device region 102.

In FIG. 2 , some elements shown in FIG. 4 are not shown in FIG. 2 for clarity. For example, the protective elements 406′ and the magnetic materials 408B₁, 408B₂, 408B₃, and 408B₄ are not shown in FIG. 2 . Therefore, the relationship between the conductive lines and the magnetic elements may be shown more clearly.

As shown in FIGS. 2 and 4 , the magnetic structure 410B₁ constructed by the magnetic element 302B₁ and the magnetic material 408B₁ wraps around a portion of the conductive line 304B₁ and a portion of the conductive line 306B₁, in accordance with some embodiments. Similarly, the magnetic structures 410B₂, 410B₃, and 410B₄ wraps around portions of the conductive lines 304B₂, 304B₃, and 304B₄, respectively. In some embodiments, the magnetic structures 410B₂, 410B₃, and 410B₄ also wraps around portions of the conductive lines 306B₂, 306B₃, and 306B₄, respectively.

In some embodiments, the magnetic structure 410B₁ and the portion of the conductive line 304B₁ surrounded by the magnetic structure 410B₁ together forms a first inductor. The magnetic structure 410B₁ and the portion of the conductive line 306B₁ surrounded by the magnetic structure 410B₁ together forms a second inductor. The first inductor and the second inductor may together form a mutual inductor. As shown in FIGS. 2 and 4 , four mutual inductors each including the magnetic structures 410B₁, 410B₂, 410B₃, and 410B₄ are formed.

The inductors formed in the device regions 102 and the nearby testing regions 104 are formed simultaneously using the same processes. Therefore, by detecting the quality and/or electrical properties of the inductors formed in the testing regions 104, the corresponding quality and/or electrical properties of the inductors formed in the device regions 102 may also be obtained. By studying the inductors in the testing regions 104, it is possible to monitor, improve, and refine a manufacturing process for forming the inductors in the device regions 102.

However, as the continuing evolution toward smaller device size and higher density, the inductance (such as the mutual inductance) that is generated by the inductor becomes smaller and smaller. As a result, it becomes difficult to measure the inductance of the individual inductor. The measurement error might be large since the measured signals become small due to the small device size. As the device size continues to shrink, the pitch between the conductive lines becomes very short. As a result, performing a WAT using automatic equipment becomes difficult since the probe size and/or probe pitch may need to be further shrunk to fit the smaller pitch between the conductive lines. The testing cost and testing time may be greatly increased. It would be very expensive if the automatic equipment for WAT needs to be updated frequently since the device size continues to shrink.

In accordance with some embodiments of the disclosure, by designing the conductive features 308A and 308B and the connection portion 304C, the conductive lines 304B₁, 304B₂, 304B₃, and 304B₄ are linked together to be electrically connected in series. The inductors constructed by the magnetic structures 410B₁, 410B₂, 410B₃, and 410B₄ and the conductive lines 304B₁, 304B₂, 304B₃, and 304B₄ are thus electrically connected in series.

Similarly, by designing the conductive features 310A and 310B and the connection portion 306C, the conductive lines 306B₁, 306B₂, 306B₃, and 306B₄ are linked together to be electrically connected in series. The inductors constructed by the magnetic structures 410Bi, 410B₂, 410B₃, and 410B₄ and the conductive lines 304Bi, 304B₂, 304B₃, and 304B₄ are thus electrically connected in series.

Because the inductors are electrically connected in series, the total inductance (such as the mutual inductance) is significantly increased. The measured signal is thus greatly increased. The detecting of the signal becomes easier, and the measurement error is reduced accordingly.

As shown in FIG. 2 , the conductive line 304B₁ is connected to a testing bump S₁, and the conductive line 304B₄ is connected to a testing bump S₂, in accordance with some embodiments. In some embodiments, the conductive line 306B₁ is connected to a testing bump S₃, and the conductive line 306B₄ is connected to a testing bump S₄.

In some embodiments, a shortest distance D between the testing bumps S₁ and S₂ is greater than two times a pitch P between the magnetic elements 302B₁ and 302B₂. In some embodiments, a pitch between the testing bumps S₁ and S₂ is in a range from about 120 μm to about 400 μm. In some embodiments, the pitch between the testing bumps S₁ and S₂ is greater than about 300 μm for high-current testing. Because the distance between the testing bumps used for detecting the electrical signal is increased, performing a WAT using automatic equipment becomes easier since the probe size and/or probe pitch may not need to be further shrunk. The testing cost and testing time may be greatly reduced.

As shown in FIG. 2 , the conductive lines 304B₁, 304B₂, 304B₃, 304B₄, 306B₁, 306B₂, 306B₃, and 306B₄ and the conductive features 308A, 308B, 310A, and 310B together form a double helix structure. FIG. 8 is a top layout view of conductive lines of a semiconductor device structure, in accordance with some embodiments. As shown in FIG. 8 , the conductive lines 304B₁, 304B₂, 304B₃, and 304B₄ and the conductive features 308A and 308B together form a first conductive path P₁. The conductive lines 306B₁, 306B₂, 306B₃, and 306B₄ and the conductive features 310A and 310B together form a second conductive path P₂. In some embodiments, the conductive paths P₁ and P₂ are physically separated from each other. In some embodiments, the conductive paths P₁ and P₂ are electrically isolated from each other and magnetically coupled with each other. In some embodiments, the conductive paths P₁ and P₂ together form a double helix structure 802, as shown in FIG. 8 .

In some embodiments, the distribution of the conductive path P₁ is symmetric with the distribution of the conductive path P2. For example, if the conductive path P₂ is turned upside down and moved leftward, the conductive path P₂ would overlap the conductive path P₁. Bu designing the conductive paths P₁ and P₂ with the double helix structure 802, the precision and accuracy of the measurement of the inductance is greatly improved.

Many variations and/or modifications can be made to embodiments of the disclosure. In some embodiments, a shielding ring 312 is formed to surround the inductors formed in the testing region 104, as shown in FIG. 2 . In some embodiments, radio-frequency (RF) signals are used to detect the inductance of the inductors formed in the testing region 104. The shielding ring 312 may be used to collect the fringing field from the inductors near the edges. The precision and accuracy of the measurement may be improved.

As shown in FIG. 2 , the shielding ring 312 is electrically connected to ground bumps G, in accordance with some embodiments. In some embodiments, the testing bump S₁, one of the ground bumps G, and the testing bump S₂ are sequentially arranged in a column, as shown in FIG. 2 . In some embodiments, the testing bump S₃, one of the ground bumps G, and the testing bump S₄ are sequentially arranged in a column, as shown in FIG. 2 .

In some embodiments, the shielding ring 312 and the conductive lines wrapped by the magnetic structures 410B₁, 410B₂, 410B₃, and 410B₄ are made of the same material. In some embodiments, the shielding ring 312 and the conductive lines wrapped by the magnetic structures are simultaneously formed using the same processes.

Many variations and/or modifications can be made to embodiments of the disclosure. In some embodiments, a shielding element 414 is formed between the semiconductor substrate 400 and the insulating layer 404, as shown in FIGS. 2 and 4 . In some embodiments, the shielding element 414 is formed in the interconnection structure 402, as shown in FIG. 4 . The shielding element 414 may be used to collect the fringing field between the nearby inductors. The precision and accuracy of the measurement may thus be improved.

In some embodiments, the shielding element 414 extends beyond edges of the magnetic elements 302B₁, 302B₂, 302B₃, and 302B₄, as shown in FIGS. 2 and 4 . In some embodiments, the shielding element 414 is electrically connected to the shielding ring 312 through conductive vias 416, as shown in FIG. 4 .

FIG. 7 is a top layout view of a shielding element of a semiconductor device structure, in accordance with some embodiments. In some embodiments, FIG. 7 shows the top layout view of the shielding element 414 shown in FIGS. 2 and 4 . In some embodiments, the shielding element 414 is a conductive mesh that includes multiple openings 702. The openings 702 may help to reduce parasitic capacitance between the shielding element 414 and the inductors, so as to improve the testing precision and accuracy.

FIG. 5 is a cross-sectional view of a semiconductor device structure, in accordance with some embodiments. In some embodiments, FIG. 5 shows the cross-sectional view of the semiconductor device structure taken along the line 5-5 in FIG. 2 . In some embodiments, the conductive line 304B₁ is electrically connected to the conductive feature 308A through a conductive via 502. The conductive feature 308A is electrically connected to the conductive line 304B₂ through a conductive via 504. As a result, the conductive lines 304B₁ and 304B₂ are electrically connected in series through the conductive feature 308A formed in the interconnection structure 402. In some embodiments, the conductive line 306B₁ extends across the conductive feature 308A, as shown in FIGS. 2 and 5 . The conductive line 306B₁ is electrically isolated from the conductive feature 308A by the insulating layer 404 and one or more dielectric layers in the interconnection structure 402.

FIG. 6 is a cross-sectional view of a semiconductor device structure, in accordance with some embodiments. In some embodiments, FIG. 6 shows the cross-sectional view of the semiconductor device structure taken along the line 6-6 in FIG. 2 . In some embodiments, the conductive line 306B₁ is electrically connected to the conductive feature 310A through a conductive via 602. The conductive feature 310A is electrically connected to the conductive line 306B₂ through a conductive via 604. As a result, the conductive lines 306B₁ and 306B₂ are electrically connected in series through the conductive feature 310A formed in the interconnection structure 402. In some embodiments, the conductive line 304B₂ extends across the conductive feature 310A, as shown in FIGS. 2 and 6 . The conductive line 304B₂ is electrically isolated from the conductive feature 308A by the insulating layer 404 and one or more dielectric layers in the interconnection structure 402.

Many variations and/or modifications can be made to embodiments of the disclosure. In some other embodiments, the shielding ring 312 surrounds more than four inductors. In some other embodiments, more than four inductors are electrically connected in series to enhance to electrical signals to be measured. As a result, the testing precision and accuracy is improved. The fabrication processes may therefore be monitored, improved, and refined more timely and more appropriately.

Embodiments of the disclosure simultaneously form inductors in a device region and a testing region using the same processes. Through the design of conductive paths in the testing region, the inductors in the testing region are electrically connected in series. As a result, the measured inductance in the testing region is enlarged. The testing precision and accuracy is therefore improved. In addition, due to the design of conductive paths, the pitch between the testing bumps is significantly enlarged, which allows the WAT process to be performed using automatic equipment. The testing cost and efficiencies are greatly improved.

In accordance with some embodiments, a semiconductor device structure is provided. The semiconductor device structure includes a semiconductor substrate and a first magnetic element and a second magnetic element over the semiconductor substrate. The semiconductor device structure also includes a first conductive line extending across the first magnetic element and a second conductive line extending across the second magnetic element. The second conductive line is electrically connected to the first conductive line. The semiconductor device structure further includes a first magnetic material partially covering the first conductive line and a second magnetic material partially covering the second conductive line.

In accordance with some embodiments, a semiconductor device structure is provided. The semiconductor device structure includes a semiconductor substrate having a device region and a testing region. The semiconductor device structure also includes multiple first conductive lines over the device region, and the first conductive lines are not electrically connected to each other. The semiconductor device structure further includes multiple first magnetic structures wrapping around portions of the first conductive lines. In addition, the semiconductor device structure includes multiple second conductive lines over the testing region, and the second conductive lines are electrically connected in series. The semiconductor device structure also includes second magnetic structures wrapping around portions of the second conductive lines. Each of the second magnetic structures has a shape and a size that are substantially the same as those of each of the first magnetic structures.

In accordance with some embodiments, a semiconductor device structure is provided. The semiconductor device structure includes a semiconductor substrate having a testing region and multiple first conductive lines over the testing region. The first conductive lines are electrically connected in series. The semiconductor device structure also includes multiple second conductive lines over the testing region. The second conductive lines are electrically connected in series, and the second conductive lines are physically separated from the first conductive lines. The semiconductor device structure further includes multiple magnetic structures wrapping around portions of the first conductive lines and wrapping around portions of the second conductive lines. The magnetic structures are arranged in a column.

The foregoing outlines features of several embodiments so that those skilled in the art may better understand the aspects of the present disclosure. Those skilled in the art should appreciate that they may readily use the present disclosure as a basis for designing or modifying other processes and structures for carrying out the same purposes and/or achieving the same advantages of the embodiments introduced herein. Those skilled in the art should also realize that such equivalent constructions do not depart from the spirit and scope of the present disclosure, and that they may make various changes, substitutions, and alterations herein without departing from the spirit and scope of the present disclosure. 

What is claimed is:
 1. A semiconductor device structure, comprising: a semiconductor substrate; a plurality of first conductive lines over the semiconductor substrate, wherein the first conductive lines are not electrically connected to each other; a plurality of first magnetic structures wrapped around portions of the first conductive lines; a plurality of second conductive lines over the semiconductor substrate, wherein the second conductive lines are electrically connected in series; and a plurality of second magnetic structures wrapped around portions of the second conductive lines, wherein a size of each of the second magnetic structures and a size of each of the first magnetic structures are substantially the same.
 2. The semiconductor device structure as claimed in claim 1, wherein shapes of the first magnetic structures and the second magnetic structures are substantially the same.
 3. The semiconductor device structure as claimed in claim 1, further comprising: a shielding ring over the semiconductor substrate, wherein the shielding ring surrounds the first magnetic structures and the second magnetic structures.
 4. The semiconductor device structure as claimed in claim 3, further comprising: a shielding element between the semiconductor substrate and the second magnetic structures.
 5. The semiconductor device structure as claimed in claim 4, wherein the shielding element is electrically connected to the shielding ring.
 6. The semiconductor device structure as claimed in claim 4, wherein the shielding element is a conductive mesh extending beyond edges of the second magnetic structure.
 7. The semiconductor device structure as claimed in claim 1, further comprising: a plurality of third conductive lines, wherein the third conductive lines are electrically connected in series, each of the third conductive lines is not electrically connected to the second conductive lines, and the second magnetic structures wrap around portions of the third conductive lines.
 8. The semiconductor device structure as claimed in claim 7, wherein the second conductive lines together form a first conductive path, the third conductive lines together form a second conductive path, the first conductive path and the second conductive path are physically separated from each other, and the first conductive path and the second conductive path together form a double helix structure.
 9. The semiconductor device structure as claimed in claim 1, wherein each of the second conductive lines extends across opposite edges of the second magnetic structures.
 10. The semiconductor device structure as claimed in claim 1, wherein the first magnetic structures laterally surround the second magnetic structures.
 11. A semiconductor device structure, comprising: a semiconductor substrate; a first magnetic structure and a second magnetic structure over the semiconductor substrate; a first conductive line wrapped around by the first magnetic structure; a second conductive line wrapped around by second magnetic structure; a third conductive line wrapped around by the first magnetic structure; and a fourth conductive line wrapped around by the second magnetic structure, wherein the fourth conductive line is electrically connected to the third conductive line, and the fourth conductive line is electrically isolated from the first conductive line.
 12. The semiconductor device structure as claimed in claim 11, wherein shapes of the first magnetic structure and the second magnetic structure are substantially the same.
 13. The semiconductor device structure as claimed in claim 11, wherein the fourth conductive line is electrically isolated from the second conductive line.
 14. The semiconductor device structure as claimed in claim 11, further comprising: a conductive feature electrically connecting the first conductive line and the second conductive line, wherein the third conductive line extends across opposite edges of the conductive feature.
 15. The semiconductor device structure as claimed in claim 11, further comprising: a plurality of third magnetic structures laterally surrounding the first magnetic structure, the second magnetic structure, the first conductive line, the second conductive line, the third conductive line, and the fourth conductive line.
 16. The semiconductor device structure as claimed in claim 15, wherein shapes of each of the first magnetic structure, the second magnetic structures, and the third magnetic structures are substantially the same.
 17. A semiconductor device structure, comprising: a semiconductor substrate; a plurality of conductive lines over the semiconductor substrate, wherein the conductive lines are electrically connected in series; a plurality of first magnetic structures wrapped around portions of the conductive lines; and a plurality of second magnetic structures surrounding the first magnetic structures and the conductive lines, wherein shapes each of the first magnetic structures and the second magnetic structure are substantially the same.
 18. The semiconductor device structure as claimed in claim 17, further comprising: a plurality of second conductive lines wrapped around by the first magnetic structures, wherein the second conductive lines are electrically connected in series, and the second conductive lines are electrically isolated from the conductive lines.
 19. The semiconductor device structure as claimed in claim 18, wherein main portions of the conductive lines and the second conductive lines are substantially parallel to each other.
 20. The semiconductor device structure as claimed in claim 17, wherein main portions of each of the first magnetic structures and each of the second magnetic structures are substantially parallel to each other. 